/Engine/Plugins/Runtime/NetworkPrediction/Source/NetworkPrediction/Public/NetworkPredictionSerialization.h
Helper to serialize an int32 frame as 8 bits. Returns the unpacked value (this will be same as input in the save path)
static int32 SerializeFrame ( [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar, int32 Frame, int32 RelativeFrame )